NTSB Identification: CHI06LA088.
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Accident occurred Monday, February 27, 2006 in Rockford, IL
Probable Cause Approval Date: 10/03/2006
Aircraft: Irwin Sonex 2180, registration: N514KP
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The experimental amateur-built airplane sustained substantial damage on impact with trees and terrain during a forced landing. The pilot reported the throttle stuck during cruise flight. The pilot attempted to get the sticking throttle to release and the throttle stuck in idle position. The kit manufacturer's examination of the throttle cable and carburetor concluded: "The throttle cable was not supported/attached to anything from the firewall to the cockpit control knob. There was a large amount of flex in the cable when the control knob was pushed when resistance was applied to the Carb End of the cable. The only anchor on the throttle cable was a "through the firewall" clamp. ... The AeroCarb was disassembled. ... Nothing internally was found that would cause it to stick."

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The loss of engine power due to the restricted movement of the throttle cable during cruise flight. A factor in the accident was the trees contacted during the forced landing.

Full narrative available

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